WeekScoop

The Nutrient 90% of People Have Never Heard Of

Choline is an essential nutrient — meaning your body cannot produce it in adequate amounts and you must get it from food. Despite this critical role, it receives almost no attention in mainstream nutrition guidance. Most people have never been told they might be deficient, and the consequences of deficiency — which are specific, serious, and entirely preventable — are routinely misdiagnosed as normal aging, stress, or other conditions. The result is millions of people living with cognitive decline that could be halted or reversed simply by getting adequate choline.

The recommended adequate intake for choline is 425mg daily for women and 550mg daily for men. The average Western diet provides significantly less than this — most people consume 200-300mg daily from dietary sources. Eggs are one of the most concentrated choline sources, with one large egg providing about 147mg. Meeting the RDA through food alone requires eating 3-4 eggs daily, which most people do not do. As a result, choline deficiency is likely the third most common nutritional deficiency in developed countries, after vitamin D and magnesium.

What Choline Does in Your Body

Choline is a precursor to acetylcholine — the primary neurotransmitter involved in memory, concentration, and muscle control. It is also required for the structure of cell membranes throughout the body, as phosphatidylcholine, which is the primary phospholipid in neuronal and other cell membranes. It is required for the export of fat from the liver, as part of VLDL synthesis. These three functions — neurotransmitter synthesis, membrane integrity, and liver fat export — cover choline’s roles in brain health, cognitive performance, and metabolic health respectively.

In the brain, choline is converted to acetylcholine via the enzyme choline acetyltransferase. This neurotransmitter is critical for attention, learning, and memory consolidation — the process by which short-term memories are stabilised into long-term storage. When choline availability is low, acetylcholine production drops, and cognitive performance suffers in ways that feel like normal age-related decline but are actually nutritional in origin.

Choline also influences the structure and function of cell membranes throughout the body. Phosphatidylcholine — the predominant phospholipid in cell membranes — requires choline as its structural foundation. Neuronal membranes with inadequate phosphatidylcholine have reduced fluidity, which impairs neurotransmitter signalling and the transport of nutrients into cells. This is particularly important in the brain, where membrane integrity directly determines signal transmission efficiency between neurons.

Why Deficiency Is So Common

Genetic factors compound the dietary problem significantly. A significant proportion of the population has polymorphisms in the PEMT gene, which codes for the enzyme that allows the body to produce choline endogenously. People with certain PEMT variants cannot synthesise sufficient choline and are more dependent on dietary intake — yet they have no way of knowing this without genetic testing, and no reason to suspect choline as the driver of their cognitive symptoms.

Pregnancy significantly increases choline requirements because choline is required for fetal brain development. Studies have shown that maternal choline intake during pregnancy influences cognitive performance in children — with higher choline intake associated with better visual memory and information processing speed. This connection is particularly important because it happens during a window that cannot be reopened: the fetal period is when the brain is most plastic and most vulnerable to nutritional deficits.

Choline and the Liver

Beyond the brain, choline is critical for liver function in ways that most people are entirely unaware of. Without adequate choline, fat accumulates in the liver because choline is required for the synthesis of VLDL — the lipoprotein that carries fat from the liver to peripheral tissues. This condition — non-alcoholic fatty liver disease (NAFLD) — affects an estimated 25 percent of the global population and is strongly associated with metabolic syndrome, insulin resistance, and type 2 diabetes. In many cases, the root cause is simple choline deficiency rather than alcohol consumption or medication use.

NAFLD is particularly insidious because it produces no symptoms until the liver damage is advanced. By the time elevated liver enzymes show up on a blood test, significant fat accumulation has already occurred. Addressing choline deficiency early can prevent this accumulation from developing in the first place.

What You Can Do Today

• Eat 2-4 eggs daily — eggs are the most bioavailable dietary source of choline, and whole egg consumption is associated with improved cognitive markers in research studies
• Include choline-rich foods regularly in your diet: liver, soybeans, chicken, fish, and cruciferous vegetables all contain meaningful amounts
• Consider a choline supplement if you do not eat eggs or animal products regularly — choline bitartrate or alpha-GPC are well-absorbed forms
• Most multivitamins contain very little choline — do not rely on a multivitamin for choline intake, as the amounts are typically inadequate
• If you experience memory problems, brain fog, or cognitive decline, choline deficiency is a reasonable hypothesis to investigate with your doctor
• Pay attention to your liver health — elevated ALT and AST on a blood panel can indicate choline-deficiency-related fat accumulation in the liver

Choline is one of the foundational nutrients for brain function, liver health, and physical performance. The fact that most people are mildly to moderately deficient — and that the symptoms of deficiency are indistinguishable from normal aging — makes choline one of the most important nutrients to optimise deliberately. The cognitive benefits of adequate choline intake are measurable and significant, and the prevention of fatty liver disease is an additional compelling reason to ensure you are getting enough.